/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.solr.core;

import org.apache.solr.search.SolrIndexSearcher;
import org.apache.solr.search.DocList;
import org.apache.solr.search.DocIterator;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.request.LocalSolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;

import java.util.List;

/**
 * @version $Id: QuerySenderListener.java 1137045 2011-06-17 21:49:38Z erick $
 */
class QuerySenderListener extends AbstractSolrEventListener {
	public QuerySenderListener(SolrCore core) {
		super(core);
	}

	@Override
	public void newSearcher(SolrIndexSearcher newSearcher,
			SolrIndexSearcher currentSearcher) {
		final SolrIndexSearcher searcher = newSearcher;
		log.info("QuerySenderListener sending requests to " + newSearcher);
		List<NamedList> allLists = (List<NamedList>) args.get("queries");
		if (allLists == null)
			return;
		for (NamedList nlst : allLists) {
			try {
				// bind the request to a particular searcher (the newSearcher)
				NamedList params = addEventParms(currentSearcher, nlst);
				LocalSolrQueryRequest req = new LocalSolrQueryRequest(core,
						params) {
					@Override
					public SolrIndexSearcher getSearcher() {
						return searcher;
					}

					@Override
					public void close() {
					}
				};

				SolrQueryResponse rsp = new SolrQueryResponse();
				core.execute(
						core.getRequestHandler(req.getParams().get(
								CommonParams.QT)), req, rsp);

				// Retrieve the Document instances (not just the ids) to warm
				// the OS disk cache, and any Solr document cache. Only the top
				// level values in the NamedList are checked for DocLists.
				NamedList values = rsp.getValues();
				for (int i = 0; i < values.size(); i++) {
					Object o = values.getVal(i);
					if (o instanceof DocList) {
						DocList docs = (DocList) o;
						for (DocIterator iter = docs.iterator(); iter.hasNext();) {
							newSearcher.doc(iter.nextDoc());
						}
					}
				}

				req.close();

			} catch (Exception e) {
				// do nothing... we want to continue with the other requests.
				// the failure should have already been logged.
			}
		}
		log.info("QuerySenderListener done.");
	}

}
